linux-kernel - Re: [v3] PCI: cadence: Fix sending message with data or without data

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Message-ID: <20250214160630.i3vbyl3e3a73onfa@thinkpad>
Date: Fri, 14 Feb 2025 21:36:30 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Hans Zhang <18255117159@....com>
Cc: lpieralisi@...nel.org, kw@...ux.com, manivannan.sadhasivam@...aro.org,
	robh@...nel.org, bhelgaas@...gle.com, bwawrzyn@...co.com,
	cassel@...nel.org, wojciech.jasko-EXT@...tinental-corporation.com,
	a-verma1@...com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, rockswang7@...il.com
Subject: Re: [v3] PCI: cadence: Fix sending message with data or without data

On Fri, Feb 07, 2025 at 06:39:23PM +0800, Hans Zhang wrote:

Subject should be changed as:

PCI: cadence-ep: Fix the driver to send MSG TLP for INTx without data payload

> View from cdns document cdn_pcie_gen4_hpa_axi_ips_ug_v1.04.pdf.
> In section 9.1.7.1 AXI Subordinate to PCIe Address Translation
> Registers below:
> 
> axi_s_awaddr bits 16 is 1 for MSG with data and 0 for MSG without data.
> 

How about,

Cadence reference manual cdn_pcie_gen4_hpa_axi_ips_ug_v1.04.pdf, section
9.1.7.1 'AXI Subordinate to PCIe Address Translation' mentions that
axi_s_awaddr bits 16 when set, corresponds to MSG with data and when not
set, MSG without data.

But the driver is doing the opposite and due to this, INTx is never
received on the host. So fix the driver to reflect the documentation and
also make INTx work.

> Signed-off-by: hans.zhang <18255117159@....com>

Please add the Fixes tag also.

- Mani

> ---
> Changes since v1-v2:
> - Change email number and Signed-off-by
> ---
>  drivers/pci/controller/cadence/pcie-cadence-ep.c | 3 +--
>  drivers/pci/controller/cadence/pcie-cadence.h    | 2 +-
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c
> index e0cc4560dfde..0bf4cde34f51 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
> @@ -352,8 +352,7 @@ static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn, u8 intx,
>  	spin_unlock_irqrestore(&ep->lock, flags);
>  
>  	offset = CDNS_PCIE_NORMAL_MSG_ROUTING(MSG_ROUTING_LOCAL) |
> -		 CDNS_PCIE_NORMAL_MSG_CODE(msg_code) |
> -		 CDNS_PCIE_MSG_NO_DATA;
> +		 CDNS_PCIE_NORMAL_MSG_CODE(msg_code);
>  	writel(0, ep->irq_cpu_addr + offset);
>  }
>  
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
> index f5eeff834ec1..39ee9945c903 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.h
> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
> @@ -246,7 +246,7 @@ struct cdns_pcie_rp_ib_bar {
>  #define CDNS_PCIE_NORMAL_MSG_CODE_MASK		GENMASK(15, 8)
>  #define CDNS_PCIE_NORMAL_MSG_CODE(code) \
>  	(((code) << 8) & CDNS_PCIE_NORMAL_MSG_CODE_MASK)
> -#define CDNS_PCIE_MSG_NO_DATA			BIT(16)
> +#define CDNS_PCIE_MSG_DATA			BIT(16)
>  
>  struct cdns_pcie;
>  
> 
> base-commit: bb066fe812d6fb3a9d01c073d9f1e2fd5a63403b
> -- 
> 2.47.1
> 

-- 
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